HIGH CHOLESTEROL – CAUSES, SYMPTOMS & TREATMENTS

Having high cholesterol can increase your risk of heart and circulatory diseases such as heart attack, stroke and vascular dementia.

What is high cholesterol?

Cholesterol is a fatty substance found in your blood. It’s produced naturally in the liver. Everyone has cholesterol. We need it to stay healthy because every cell in our body uses it. Some of this cholesterol comes from the food we eat. High cholesterol is when you have too much cholesterol in your blood. This can increase your risk of heart and circulatory diseases such as heart attack and stroke.

What are the types of cholesterol?

There are two main types of cholesterol, one good and the other bad. Having too much ‘bad’ cholesterol can cause problems with your health. Cholesterol is carried in your blood by proteins. When cholesterol and proteins combine, they’re called lipoproteins.

High-density lipoproteins or HDL is called ‘good’ cholesterol. This is because it gets rid of the ‘bad’ cholesterol from your blood. It takes cholesterol that you don’t need back to the liver. The liver breaks it down so it can be passed out of your body.

Non-high-density lipoproteins or non-HDL is called ‘bad’ cholesterol. This is because when there is too much of it, it can build up inside the walls of the blood vessels. This clogs them up causing narrowing of the arteries which increases your risk of having a heart attack or stroke.

You may have also heard ‘bad’ cholesterol being called ‘LDL’ cholesterol. This was previously used as the main measure of bad cholesterol but we now know that other forms of non-HDL cholesterol are also harmful.

Why is high cholesterol bad for you?

Non-HDL take cholesterol from the liver to the cells around your body. Too much bad cholesterol (non-HDL) can be harmful because it sticks to the inside walls of your arteries. This can lead to fatty material (atheroma) building up – this process is known as atherosclerosis. It makes it harder for blood to flow through, which can lead to a heart attack or a stroke.

If your total cholesterol is high, it can mean that you have a lot of bad (non-HDL) cholesterol in your blood. A high level of good (HDL) cholesterol can help keep that bad cholesterol in check and remove it from your body.

Dr Barbara Karin Vela is an International Member of Royal College Of General Practitioners, UK